2.4 bleed, blooming:
A, failure phenomenon:
The bottomed varnish or the full-text version of the ink, in the substrate carrier, the penetration of the pigment into the ink film and the oil film causes the surface ink or varnish color pigment to change or develop. We know that pigments that bleed easily are precipitated on the ink film of the printing ink or on the oil film surface of the coating oil, called blooming.
B. Reasons:
Coloring substances in the surface of packages such as plastic or aluminum foil substrates or colored pigments in the underprint layer are dissolved by the solvent of the surface ink and migrate into the ink film or oil film to cause bleed and blooming, and inorganic pigments generally do not have such problems. Red or purple organic pigments are more problematic. The base ink or base oil is compatible with the solvent in the surface ink system, and the solvent resistance of the pigment should be taken into consideration.
C. Countermeasures:
The following methods can be used when the needles are packaged in a variety of plastic or foil substrates: (1) In order to prevent bleeding, sealable base oils or full-size white or yellow inks can be used, their resistance to solvents and leveling. All good. For another example, the alcohol-soluble polyamide resin is combined with polyvinyl butyral or Damar resin with silver powder, mica powder, etc. to make up a single-component white ink or varnish with a closed color and a two-component polyurethane ink. Oil; (2) In the use of organic pigments, pigments with good solvent resistance, base oil, surface oil, ink color, and hue with structural colors that are as close as possible to the hue should be selected; (3) when the ink, varnish, or printing is full When the primer is a one-component thermoplastic ink or varnish, a small amount of a thermosetting resin binder is added in an appropriate amount to ensure the ink film adhesion after cooking. The solvent on the surface of the ink film should be selected to be compatible with poor solvent; (4) When the full version of white ink or yellow ink or full-bottom oil is completely cured, the surface color printing is performed again. When the ink is printed, the color of the overprint is dry. , and then the last cover printing or full version of light oil cover.
A, failure phenomenon:
The bottomed varnish or the full-text version of the ink, in the substrate carrier, the penetration of the pigment into the ink film and the oil film causes the surface ink or varnish color pigment to change or develop. We know that pigments that bleed easily are precipitated on the ink film of the printing ink or on the oil film surface of the coating oil, called blooming.
B. Reasons:
Coloring substances in the surface of packages such as plastic or aluminum foil substrates or colored pigments in the underprint layer are dissolved by the solvent of the surface ink and migrate into the ink film or oil film to cause bleed and blooming, and inorganic pigments generally do not have such problems. Red or purple organic pigments are more problematic. The base ink or base oil is compatible with the solvent in the surface ink system, and the solvent resistance of the pigment should be taken into consideration.
C. Countermeasures:
The following methods can be used when the needles are packaged in a variety of plastic or foil substrates: (1) In order to prevent bleeding, sealable base oils or full-size white or yellow inks can be used, their resistance to solvents and leveling. All good. For another example, the alcohol-soluble polyamide resin is combined with polyvinyl butyral or Damar resin with silver powder, mica powder, etc. to make up a single-component white ink or varnish with a closed color and a two-component polyurethane ink. Oil; (2) In the use of organic pigments, pigments with good solvent resistance, base oil, surface oil, ink color, and hue with structural colors that are as close as possible to the hue should be selected; (3) when the ink, varnish, or printing is full When the primer is a one-component thermoplastic ink or varnish, a small amount of a thermosetting resin binder is added in an appropriate amount to ensure the ink film adhesion after cooking. The solvent on the surface of the ink film should be selected to be compatible with poor solvent; (4) When the full version of white ink or yellow ink or full-bottom oil is completely cured, the surface color printing is performed again. When the ink is printed, the color of the overprint is dry. , and then the last cover printing or full version of light oil cover.
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